Inductor-alternator.



E. PODLE$AK.

INDUCTOR ALTERNATOR.

APPLICATION FILED DEC. 27, 1911.

Patented June 2, 1914-."

' [N VEN T OR: v Mlocllea I A Home 3 SHEETS-SHEET 1.

E. PUDLB'AK.

Y INDUGTOR ALTERNATOR. APPLICATION FILED DEC. 27, 1911.

1,098,754. Patented June 2, 19m

3 SHEETSSHEET 2.

WITNESSES INVENTOR w E. PUDLESAK. INDUGTOR ALTERNATOR;

APPLICATION FILED DEC. 27,1911.

: ,098,754 Patented June 2, 1914.

3 SHEETS-SHEET 3.

IV/TNESSES [NVl 'i/VTOR g g 4 EmzZPodZesk r 6 A Home EMIL ron EsAx, or 'rrrrm, onro.

INDUCTOR-ALTERNATOR.

Specification of Letters Patent.

Patented J une 2, 1914.

original ap licationfiled July 21,- 1911, Serial No. 639,738. Divided and this application filed December 27, 1911. Serial No. 668,153. i

the requirement of the United States Pat- The invention relates to current generators of the induction alternator type especially designed for use in Connection with gas engine igniters of the mechanical make and break type.

'The general object of the invention is to improve and simplify the construction and operation of machines of this character so as to be comparatively inexpensive to manufacture, of durable and substantial design, and having a high eflicieney inconnection with sparking devices when the size and weight of the machine is considered.

Among the specific objects, the inventionhas to provide an improved arrangement of pole pieces and inductor or rotor whereby magnetic flux variations can. be effectively produced with respect to the generating windings for causing the generation of a sparking current of great intensity, the pole pieces being of the trifurcated type with the middle polar projection wound, and the inductor is of the cruciform type to cooperate with the polar projections to vary the paths of the magnetic flux with respect to the, winding.

Another object of the invention is to pro-- tures of construction and arrangement of parts which will be more fully described hereinafter and set forth with particularity in the claims appended hereto.

. In the accompanying drawings, which 1ll ustrate one embodiment of the invention, Figure 1 is a side elevation of the machine shown in connection with the sparking device. Fig. 2 is a front view thereof. Fig. 3 is a fragmentary rear view-of the machine with the igniter frame in section. Fig. 4 is a sectional view through one of the pole pieces and the side plates of the'frame, the section being taken on line 44, Fig. 3. Fig. 5 is a partial sectional view of the machine taken transversely to the axis of the rotor and immediately to the front of the pole pieces. Fig. 6 is a perspective view of one ofthe bowed springs interposed between the extremity of the magnets for clamping the inner magnet against the extremity of the pole piece.

Similar reference characters are employed to designate corresponding parts throughout the views.

In Fig. 1, the current generator A is shown in connection with a make and break igniter B, for which the generator is especially designed, although it may be put to other service. The generator A is mounted on a base C which is a part of the frame of the igniter B, and the frame of the generator is attached to the base C by bolts 1 passing through openings 2 in the base C and screwing into the side plates 3 and 4 of the generator frame, the openings 2 being larger than the threaded shanks of the screws, so that the generator frame can be adjusted on the base in proper relation to the igniter B.

The frame of the generator is non-magnetic and comprises front and rear side plates 3 and 4 and end plates 5, which are fastimed to the ends of the side plates by screws 6 so that the said plates form a rectangular frame for holding the pole pieces D, which are preferably laminated and are clamped between the side plates 3 and 4 b means of through bolts 7 adjacent the on s of the side plates. The center of each side plate has opening 8 that is closed by a removable bearing plate 9 secured in place by bolts 10, said bolts passing from one side to the other and through the same, and

- downwardly into flan The pole pieces'D are trifurcated and' made of' approximately E-shaped steel stampings that are secured together by riv ets 14, and these pole pieces are diametrically disposed with respect to the rotor E. The outer faces of the pole pieces-are formed with upper and lowensteps 15' and 16, which are spaced from the end plates 5 so as to provide recesses into which the ends ofthe inner and outer U-shapd magnets 17 and 18 extend, the said 'magnets being held against lateral displacement by means of the side plates 3 and 410i the generator frame. The outer magnets 18 are. clamped against the steps 16 by screws 19 that are threaded in bosses 20 on the end plates and bear at their inner ends on the extremities of the magnets 18. The extremities of the magnet 17 are held against the steps 15 of the pole pieces by the interpositlon between the magnets of bowed springs ore-equivalent resilient devices 21, as shown in Fig. 5..

In this manner," the magnetsare efiectively held in place without their extremities being bored for the reception of screws or other fastenings and at the same tune-the magnets can be readily taken out. TIt will be seen that the magnets have a large areaof contact with the pole pieces so that magnetic reluctance is reduced to a minimum.

Cooperating with the frame of the 'machine are top and bottom plates '22 and '23, respectively, the former being better shown in Figs. 2 and 3, and the latter'in Fig.1. The top plate. is fastened by screws 24 to the side plates 3ai1d 4: of the machin'eframe, and the bottom plate 23 has its edges bent 25 through which pass screws or.- other astenin threaded in the side plates 0 the machine frame. Thus the side plates 3 and 4,"e.nd'

plates 5, and top and bottom plates 22 and 23 form a tight housin for the enerator windings, pole pieces and-rotor, sp t atnone of these parts can be injured by'the effects -of the elements.

As clearly shown in Fig. 5, the rotor E is of cruciform shape in cross section, and it .is preferably made of laminae fastened together by rivets 27. The extremities of the arms 28 are enlarged to give comparatively wide faces 29 that cofipcrate with the extremities of the polar projections 30, 31 and 32. The polarprojection 31 is-shown with a polar face of greater area than the polar face of the outer projections 30 and 32, and the polar faces 29 of the rotor are 26 that are hooked. These'spools.are"held in place 'on approximately the same' as the middle pro jeotions in area. The generatin windings F are located on the middle po ar projections 31, and electno-motive force is gener-. ated therein by variations in the paths of magnetic flux through the polar projections and rotor, as will be more fullydescribed hereinafter. -These windings- F are connected together by a wire" 31', one winding. being grounded on the frame of the machine at 34, Fig. 1, by a wire 35, and the other winding being connected with the ig niter by awire 36. The windings F are preferably of the formed type and are placed over the middle polar projectionjsto which they are suitably secured. The-boltsi10 pass through the outer polar projections so that they do not interfere with. theremoval or replacing of the windings when occasion requires.

The rotor is adapted to have an oscillatory movement so as to cha-ngethe magnetic flux through. the pole piecesyand hence with respect to the windings for generating a sparking current; On the front end of the 90 rotor'shaft 12which extends forwardly from the front. bearing' plate' arefast'ened oppositely-disposed crank arms. 37 that carry studs 39 to whichlarerespectively secured" helical extensiomsprings ldwhichhave their ,outer'end's fastenedto studs or extensions 41 on'the end plates 5-of the generator frame, therebeing on-the studs 3 andl spools 42 around which the ends of the springs. are

the studs by cotterpins or equivalent fas tenings43. The springsO are normally in axial alincment with each other and with the center .lihes'of the crank. arms 3'lj' and .38, and the springs thus. hold the rotor-in a given position with respect. to the pole. pieces, such position" shown in the present instancebyfull lines in 5. When the rotor is turned, the springs 40 are placed undertension by theirlinner ends being carried'iaround with the studs 39 as'the rotor shaft is turned through a short are. Upon the shaft being released, the' springs contract and effect the return movementof the rotor, but by reason 'of the peculiar dis;

'p'ositionof the springs, ,the' rotor flies beybnd its normal centralposition a short distance and rebounds, back.- Themeans for. moving the rotorm' opposition to the tension ofthe springs 4=0consists of a'wipearm 45 on the rear endofi the rotor sha ,as shown in Figs. 1 'and'3; said arm being .engaged by a reciprocatory rod46-or equivalent. device, Fig. 3, which moves by a suitable part of the engine with which the gt'anerator and igniter are Used, the movement being in timed relation with the cycle of the operation, so that the generator and sparking device will be actuated at the proper time. The actuator :16 moves to the right,

ocum Fig. 3, to give a clockwise movement to the arm 45 of only a few degrees, and then upon the return of the actuator, the arm 45 quickly snaps back and allows the rotor to swing rapidly from one polar projection to piece having steps, a plurality of magnets another for changing the magnetic flux with respect to the generating windings F. More specifically, the rotor is moved from the full line position, Fig. 5, to the dotted line posi tion a. This movement is more or less gradual, and as the arms of the rotor are now in line with the outer polar projections, the lines of force will pass through the latter from the positive pole piece through the rotor and outer polar projections of the negative pole pieces. After the rotor has been moved to cocked position, as indicated by the dotted lines a, the rotor is released and quickly returned by the springs toward the normal position shown by full lines, but the rotor overtravels such position and reaches the position indicated approximately by the dotted linesb. The magnetic flux is now quickly concentrated through the middle polar projections 31, and hence the lines of force thread the generating windings F, and it is during this time that the electro-motive force is built up for producing the igniting current, the operating connections between the rotor and sparking device being such that the electrodes will separate when the current is at maximum intensity. Y

The details of the operating connections tween the igniter and rotor need not here e described, asthe same are fully set forth and claimed in the parent'application, of which this is a division.

From the foregoing description, taken in connection with the accompanying drawings, the advantages of the construction and of the method of operation willbereadil apparent to those skilled in the art to whic the invention appertains, and while I have described the principle of operation of the invention, together with the apparatus which I now consider to be the best embodiment thereof, I desire to have it understood that the apparatus shown is merely illustrative, and that such changes may be made when desired as are within the scopeof the claims appended hereto.

Having thus described the invention, what I claim as new, is

1. The combination of a frame, a pole iece secured thereto and forming with-the rame a recess, a magnet having one end fitted in the recess, and a clamping screw threaded in the frame and bearing against the magnet to clamp the same against the pole iece.

2. The combination of a frame, a pole piece secured therein and spaced from one end of the frame to form with the latter a 6 recess, the wall of the recess formed by the against lateral displacement by the side plates, and resilient means held between the one end disposed between theplate and pole pole piece being stepped, and magnets havmg extremities extending into said recess and clamped against the stepped side of the pole piece.

3. The combination of a frame, a pole extending into the frame and each bearing 3 on a step of the pole piece, a clamping means between the frame and one magnet, and a yielding element disposed between the mag nets and held by said clamping means under tension to clamp the other magnet against the pole piece. 4. The combination of side and end plates, a pole piece secured between the side plates, a magnet having one end extending between the pole piece and one end plate, and means engaged with the end plate and magnet for clamping the latter against the pole piece. 5. The combination of side a'ndend plates, a pole piece secured between the side plates, a magnet having one end extending between the pole piece and one -end plate, a second magnet disposed under the firstsand held magnets for maintaining the second magnet against the pole piece.

6. The combination of side and end plates secured together, a pole piece secured between the side plates and having a stepped surface next to the end' plate, a-short magnet and a long magnet extending between the end plate and pole piece and engaging the stepped surface thereof, said magnets being held against lateral displacement by the side plates, a clamping means acting between the end plate and long magnet .for holding the latter against the pole piece, and a resilient means between the long and short magnet for holding the latter against the pole piece.

7. The combination of a pole piece, a plate fixed with respect thereto, a magnet having 110 piece, and a clamping screw threaded in the plate and having its, end bearing on the magnetfor clamping the same against the pole piece. r

8. The combination of a pole piece, a pair of magnets arranged one.within the other, means for holding one magnet against the pole piece, and means disposed between the magnets for holding the other magnet against the pole piece.

9. The combination of a pair of oppositelydisposed polepieces having their outer faces provided with upper and lower steps, a U-shaped magnet havingv its extremities clamped against-the upper stepa of the pole pieces, a larger U-shaped magnet fitting over the first and clamped against the lower steps, means for clamping the larger magnets into contact with the pole pieces, and yielding means interposed between the extremities of the two inagnets whereby the first-mentioned magnet .is held against the pole pieces. t

10. The combination of a frame having connected side and end plates, pole pieces secured within the frame a rotor between the pole pieces, said side plates having openings of such size as to permit the rotor to pass axially therethrough, bearing plates secured at" the openings, and an axle for the rotor journaled in the bearing plates.

11. The combination of a frame having connected side and end plates, pole pieces secured within the frame, arotor between the pole pieces,.said side plates having openings of such size as to permit the rotor to pass axially therethrough, bearing plates sc cured at the openings, an axle for the rotor journaled in the bearing plates, and through bolts passing through the bearing and side plates and through the pole pieces.

12. The combination of pole pieces, side plates, bolts passing through the side plates and pole pieces, end plates bolted to the ends of the side plates, horseshoe magnets spanning the-pole pieces and having their ends disposed betweenthe end pole pieces and also between the side plates, and means on the 'endplates for clamping the magnets against the pole pieces.

13. The combination of pole pieces having inner and outer polar projections, side plates having openings, a rotor disposed between the pole pieces and removable through the openings of the side plates, bearing plates fitted to the openings, and bolts passing through the bearing plates and outer projections of the pole pieces. a

14. The combination of pole p'icces having inner and outer polar projections, side plates having openings, a rotor disposed between the pole pieces and removable through the openings of the side plates, bearing plates fitted to the openings, bolts passing through the bearing plates and outer projections of the pole pieces, and formed windin s fitted to the inner polar projections of the pole pieces.

Copies of this patent may be obtained for plates and bottom plate The combination of side plates, pole five cents each, by addressing the Washington, D. 0."

pieces secured between the side plates, a rotor between the pole pieces, magnets connected with the pole pieces, end plates fastened to the side plates and cooperating therewith for holding the magnets in place,

said end plates havingextensions, crank arms connected with the rotor, and springs connected with the crank arms andwith the extensions of the end plates. l

16. The combination of pole pieces, magnets, end plates for clamping the magnets to the pole pieces, said. end plates having ex-' tensions, a rotor disposed between the pole pieces, crank arms connected with the rotor, and springsconne'cted with the saidcrank arms and the extensions of the end plates for normally holding the rotor in a given position with respect to the pole pieces.

17. The combination of side pieces secured between the same, windings thereon, end plates secured to the side plates, magnets clamped between the end plates and pole pieces, a rotor rotatably mounted between the pole pieces and supported by the side plates, a top plate fastened to the side plates and extending between the extremities of the magnets, and a bottom plate disposed under the pole pieces and secured to the side plates. a

18. The c mbination of a supporting base, side plates soured thereto, pole pieces disposed between the, side plates, windings plates, pole thereon,'a rotor between the pole pieces and supported by the side plates, U-shaped magnets having their extremities clamped to the pole" pieces, a top plate disposed under the magnets and secured to the side plates, and a disposed under thepole pieces and above the said base and securedto the side? plates, said top andb plates cooperating with the side platesyto form -'a housingfor the rotor and windings;

1 In testimony whereof I afiix my signature in presence of two witnesses.

EMIL 'PODLESAK.

\Vitnesses:

'. J ENNIE H. FIEGE,

' HA1. W. Mionanns;

"Commissioner of Yatcntxs, 

